Namespaces
Variants

std::function<R(Args...)>:: swap

From cppreference.net
C++
Utilities library
Function objects
Function invocation
(C++17) (C++23)
Identity function object
(C++20)
Old binders and adaptors
( until C++17* )
( until C++17* )
( until C++17* )
( until C++17* )
( until C++17* )
( until C++17* )
( until C++17* ) ( until C++17* ) ( until C++17* ) ( until C++17* )
( until C++20* )
( until C++20* )
( until C++17* ) ( until C++17* )
( until C++17* ) ( until C++17* )

( until C++17* )
( until C++17* ) ( until C++17* ) ( until C++17* ) ( until C++17* )
( until C++20* )
( until C++20* )
std::function
void swap ( function & other ) noexcept ;
(depuis C++11)

Échange les objets appelables stockés de * this et other .

Table des matières

Paramètres

other - fonction wrapper pour échanger l'objet appelable stocké avec

Valeur de retour

(aucun)

Exemple

Exécuter ce code 
#include <functional>
#include <iostream>
void foo(const char* str, int x)
{
    std::cout << "foo(\"" << str << "\", " << x << ")\n";
}
void bar(const char* str, int x)
{
    std::cout << "bar(\"" << str << "\", " << x << ")\n";
}
int main()
{
    std::function<void(const char*, int)> f1{foo};
    std::function<void(const char*, int)> f2{bar};
    f1("f1", 1);
    f2("f2", 2);
    std::cout << "f1.swap(f2);\n";
    f1.swap(f2);
    f1("f1", 1);
    f2("f2", 2);
}

Sortie : 

foo("f1", 1)
bar("f2", 2)
f1.swap(f2);
bar("f1", 1)
foo("f2", 2)

Voir aussi

échange les cibles de deux objets std::move_only_function
(fonction membre publique de std::move_only_function )